http://earthwise-staging.bgs.ac.uk/index.php?action=history&feed=atom&title=File%3AGSG_GLA_FIG_25_13.jpg 2026-04-18T23:54:45Z Revision history for this page on the wiki MediaWiki 1.42.3 http://earthwise-staging.bgs.ac.uk/index.php?title=File:GSG_GLA_FIG_25_13.jpg&diff=39620&oldid=prev 2019-02-11T17:14:25Z

<p>User created page with UploadWizard</p> <p><b>New page</b></p><div>=={{int:filedesc}}==<br /> {{Information<br /> |description={{en|1=Figure 25.13. Explanation of the development of various lava structures and tuffs in lavas which enter the sea from the land. A, the lava front is moving slowly and as it enters the sea where it is rapidly chilled, all of it is converted to tuff at the shoreline. Waves and currents move the tuff offshore. If the tuffs are generated in sufficient abundance then the lavas will flow over them to build up a hyalotuff delta, as seen at Slockenray. B, Lava is moving sufficiently rapidly to enter into the sea, but much of its outer skin is chilled by contact with the sea water. The chilled skin is inflated by magma which is under pressure and many pillows are produced. C, the lava advance is rapid, so that the outer skin chills and forms pillows, either by contact with water at its top surface or by tuff at the base. However the rapidly moving interior is insulated by this pillow growth and cools to form a massive lava which cannot be chilled by contact with the sea water. The porphyritic lava at Slockenray is of this type: it is pillowed at the top and sometimes at the base, but has a thick, massive interior.<br /> {{GSGGlasgow}}}}<br /> |date=2019-02-11 17:04:32<br /> |source=Geological Society of Glasgow<br /> |author=Geological Society of Glasgow<br /> |permission=<br /> |other versions=<br /> }}<br /> <br /> =={{int:license-header}}==<br /> {{subst:Custom license marker added by UW}}<br /> {{GSG1}}<br /> <br /> [[Category:Uploaded with UploadWizard]]</div>

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